Solve \( 3 x^{2}-12 x=0 \) When (i) \( x \in N \) (ii) \( x \in Z \) (iii) \( x \in S \) where \...

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Solve \( 3 x^{2}-12 x=0 \)
When
(i) \( x \in N \)
(ii) \( x \in Z \)
(iii) \( x \in S \) where \( S=\{a+i b: b \neq 0 ; a, b \in R\} \)
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